Cynthia Sierra, MD
NPI 1437252905 · Family Medicine Physician · Chula Vista, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cynthia Sierra, MD is a Family Medicine Physician provider in Chula Vista, CA (NPI 1437252905).
Provider details
- NPI number
- 1437252905
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A93042 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
13 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 13 | $137 |
Typical Medicare-allowed amounts for these services range $137–$137 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 125 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 471 | 205 |
| Levothyroxine Sodium | 290 | 109 |
| Losartan Potassium | 276 | 106 |
| Amlodipine Besylate | 264 | 115 |
| Metformin Hcl | 240 | 87 |
| Rosuvastatin Calcium | 226 | 95 |
| Omeprazole |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-07
- Last updated
- 2021-12-01
Frequently asked questions
- What is Cynthia Sierra's NPI number?
- Cynthia Sierra's National Provider Identifier (NPI) is 1437252905, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cynthia Sierra's specialty?
- Cynthia Sierra is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Cynthia Sierra located?
- Cynthia Sierra's practice location on file with NPPES is 865 3rd Ave, Chula Vista, CA 91911-1300.
- What is Cynthia Sierra's phone number?
- The practice phone number listed in the NPPES registry for Cynthia Sierra is (619) 498-6200.
- Does Cynthia Sierra accept Medicare?
- Cynthia Sierra is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cynthia Sierra's NPI active?
- Yes — Cynthia Sierra's NPI (1437252905) is active in the NPPES registry as of the last update on 2021-12-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.